#!/bin/sh
found=false
printf >&2 "Checking for old/new clone mechanics... "
cat > dummy.c <<EOF
#include <sched.h>
int clone(int (*fn)(void *), void *child_stack, int flags, void *arg, ...) { return 0; }
EOF
if	${CC} -c -o dummy.o dummy.c >/dev/null 2>&1; then
	rm -f dummy.c dummy.o
	echo >&2 "New clone."
	echo "linux/newclone"
	found=true
fi
cat > dummy.c <<EOF
#include <sched.h>
int clone(int (*fn)(void *), void *child_stack, int flags, void *arg) { return 0; }
EOF
if	! $found && ${CC} -c -o dummy.o dummy.c >/dev/null 2>&1; then
	rm -f dummy.c dummy.o
	echo >&2 "Old clone."
	echo "linux/oldclone"
	found=true
fi
rm -f dummy.c dummy.o
if ! $found; then
	echo >&2 "Can't tell, omitting clone(2) support."
fi

if	$port_xattr; then
	cat > dummy.c <<EOF
#include <sys/types.h>
#include <sys/xattr.h>
#include <attr/attributes.h>
int i;
EOF
	if ! ${CC} -c -o dummy.o dummy.c >/dev/null 2>&1; then
		echo >&2 "Warning: Can't compile trivial program using <attr/attributes.h>".
		echo >&2 "         xattr support will require that header."
	fi
	echo "linux/xattr"
else
	echo "linux/noxattr"
fi
rm -f dummy.c dummy.o

cat > dummy.c <<EOF
#include <sys/statvfs.h>
int i;
EOF
if ! ${CC} -c -o dummy.o dummy.c >/dev/null 2>&1; then
	echo >&2 "Warning: Can't compile trivial program using <sys/statvfs.h>".
	echo >&2 "         xattr support will require that header."
else
	echo "linux/statvfs"
fi
rm -f dummy.c dummy.o

# For statx, we want a pseudo which can work with OE's uninative, i.e. build on a system without
# statx but work on one with it. We have a header in nostatx to allow this.
cat > dummy.c <<EOF
#define _GNU_SOURCE
#include <sys/stat.h>
struct statx x;
EOF
if ${CC} -c -o dummy.o dummy.c >/dev/null 2>&1; then
	echo "linux/statx"
else
	echo "linux/nostatx"
	echo "linux/statx"
fi
rm -f dummy.c dummy.o